1. Biosystematic studies in Aster. I. Crossing relationships in the HETEROPHYLLI;Avers;Amer. Jour. Bot. In press,1953
2. Experimental studies on the nature of species. I. Effect of varied environments on western North American plants;Clausen;Carnegie Inst. Wash. Pub. 520,1940
3. Inheritance in Nicotiana tabacum. XVIII;Clausen;Monosomic analysis. Genetics,1944
4. Interspecific hybrids in Crepis. III. Constant fertile forms containing chromosomes derived from two species;Collins;Genetics,1929